Grinding-fvlachine



(No Model.)

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Patented Jan. 11, 1898.

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CHARLES F. TEBBETTS, OF BOSTON, MASSACHUSETTS.

GRlNDlNG-MACHlNE SPECIFICATION forming part of Letters Patent No. 597,033, dated January 11, 1898.

Application filed October 16, 1896- Serial No. 609,15 7. (N0 model.)

To all whom, it may concern:

Be it known that I, CHARLES F. Tneenrrs, of Boston, county of Suffolk, and Commonwealth of Massachusetts, have invented certain Improvements in Grinding-Machines, of which the following, read in connection with the accompanying drawings, is a complete specification.

This invention relates to grinding-machines, and is represented in the present instance as pertaining to mechanism for grind ing balls.

In the drawings, Figure 1 is an elevation, partly in section, of a machine embodying this invention. Figs. 2 and 3 are similar views representing details to be referred to hereinafter.

Suitablyjournaled for rotation in the standards 2 2 is the conveyer-shaft 3, having the pulley l, whereby rotative movement is imparted thereto. Said shaft is shown as provided with the spiral groove 5 and a supplemental narrower groove 6, cut in the bed of spiral groove 5. It has one end located beneath the hopper 7. Said hopper, being adapted for holding balls in bulk, has its exit-passage, wherethrough the balls discharge, located in position for depositing the ball into spiral groove 5 of the conveyer-shaft. The conveyor-shaft is surrounded by a casing 3, having the longitudinal groove 9, wherethrough the balls in the groove of said conveyor project upwardly a portion of their body parts. Above the conveyor and groove 9 is located the grinder. As shown in the present instance, a series of grinders 10 are represented, and it is such a construction that I prefer, as it gives provision for using grinders of different grades of fineness, whereby the balls may be first rough ground and then subsequently finished to any degree of fineness. The grinders represented may be supported and revolved by any suitable mechanism, all of which is obvious.

In operation the balls are placed in the hopper 7 in bulk and gravitate downwardly through the discharge-passage of the hopper to position where, as the conveyer-shaft moves, its spiral groove receives the balls one by one, and further moving conveys the suitable receptacle.

balls along groove 9 of the casing S to the grinder, one after another. The balls finally reach the terminal end of the groove in said conveyor and are lifted therefrom through the opening in casing 8, to fall below in any To facilitate this operation, the spiral groove 5 has its'terminal end beveled upwardly to the surface of said conveyer-shaft. Balls, when forged, are left with a small teat 12 at the point where severed from the metallic bar. (See Fig. 3.) It is to accommodate this teat formation that I emthereof are the marginal edges of groove 9, and a construction having such marginal.

edges would clearly be an equivalent involving the spirit of my invention.

I claim 1. In a machine of the character indicated, the hopper, 7, the grooved casing, S, the conveyer-shaft having spiral groove, 5, and one or more grinders, all in combination, substantially as described.

2. A machine of the character indicated, having a conveyor-shaft provided with spiral groove, 5, and supplemental groove, 6, substantially as described.

3. A machine of the character indicated having a conveyer-shaft provided with spiral groove, 5, and easing, 8, said shaft having its spiral groove beveled upwardly at the terminal' end thereof, whereby objects are lifted therefrom over the casing, substantially as described.

Signed at Lynn, Massachusetts, this 7th day of October, A. D. 1896.

CHAS. F. TEBBETTS.

W'itnesses:

C. B. TUTTLE, A. M. TUTTLE. 

